Phosphor conversion for WLEDs: YBO3: Ce3+, Tb3+ and its effects on the luminous intensity and chromatic properties of dual-layer WLED model

• Autorzy: My Le Thi Thuy , Thai Nguyen Le , Bui Thuc Minh , Lee Hsiao-Yi , Anh Nguyen Doan Quoc

Identyfikatory

DOI

10.2478/msp-2022-0050

• Języki publikacji: EN

Abstrakty

EN

Yttrium borate phosphor co-doping Ce³⁺, Tb³⁺ions (YBO₃: Ce³⁺, Tb³⁺) is fabricated using solid state reaction, and then its luminescence is investigated through the computational energy transfer process. Under excited near-UV light, this YBO₃: Ce³⁺, Tb³⁺ phosphor exhibits strong absorption with broad and sharp emission bands due to the 4f – 5d and 5d – 4f transitions of Ce³⁺ ions and the 4f – 4f transition of Tb³⁺ ions, respectively. The phosphor’s emission chromaticity could be tunable by adjusting the concentration of doping ions. With 15% Tb³⁺ and 3% Ce³⁺ in the composition, the phosphor can gain maximum 76.7% external quantum efficacy. The phosphor is proposed for utilization in the phosphor package of white light-emitting diodes (WLEDs) to enhance their lighting performances. The findings point out that by modifying YBO₃: Ce³⁺, Tb³⁺ concentration (5% – 10%), improvements in luminous intensities, color consistency, and color rendering indices can be observed. The higher concentration (10%) of YBO₃: Ce³⁺, Tb³⁺ is more advantageous to the luminous flux and chromatic uniformity in cases of 4000 K and 5000 K WLEDs, while lower (5%) concentration greatly benefits those properties in the case of 3000 K WLED. Regardless of CCTs, the WLEDs show a reduction in chromatic reproduction efficiency with the increasing concentration of YBO₃: Ce³⁺, Tb³⁺ . Hence, this green phosphor could be a good material for high-luminescence WLED, yet the modification of phosphor concentration is advisable if the simultaneous good chromaticity is desired.

Słowa kluczowe

EN

WLEDs; YBO3:Ce3+,Tb3+; luminous intensity; chromatic properties; remote phosphor structure; dual-layer phosphor

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2022
• Tom: Vol. 40, No. 4
• Strony: 105--113
• Opis fizyczny: Bibliogr. 26 poz., rys.

Twórcy

autor

My Le Thi Thuy

• Faculty of Basic Sciences, Vinh Long University of Technology Education, Vinh Long Province, Vietnam

autor

Thai Nguyen Le

• Faculty of Engineering and Technology, Nguyen Tat Thanh University, Ho Chi Minh City, Vietnam

autor

Bui Thuc Minh

• Faculty of Electrical and Electronics Engineering, Nha Trang University, Nha Trang City, Vietnam

autor

Lee Hsiao-Yi

• Department of Electrical Engineering, National Kaohsiung University of Science and Technology, Kaohsiung, Taiwa

autor

Anh Nguyen Doan Quoc

• Faculty of Electrical and Electronics Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).